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We report on the use of extreme ultraviolet (XUV, 30.3 nm) radiation from the Free-electronLASer in Hamburg (FLASH) and visible (Vis, 405 nm) photons from an optical laser toinvestigate the relaxation and fragmentation dynamics of fluorene ions. The ultrashort laserpulses allow to resolve the molecular processes occurring on the femtosecond timescales.Fluorene is a prototypical small polycyclic ar
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We investigated the dissociation of dications and trications of three polycyclic aromatic hydrocarbons (PAHs), fluorene, phenanthrene, and pyrene. PAHs are a family of molecules ubiquitous in space and involved in much of the chemistry of the interstellar medium. In our experiments, ions are formed by interaction with 30.3 nm extreme ultraviolet (XUV) photons, and their velocity map images are rec
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Extreme-ultraviolet pulses can propagate through ionised solid-density targets, unlike optical pulses and, thus, have the potential to probe the interior of such plasmas on sub-femtosecond timescales. We present a synthetic diagnostic method for solid-density laser-generated plasmas based on the dispersion of an extreme-ultraviolet attosecond probe pulse, in a pump–probe scheme. We demonstrate the
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Deprived neighborhoods in Sweden in which criminal networks have a negative impact on local residents are labeled as “vulnerable neighborhoods” by the police. The method used by the police to classify such neighborhoods is largely based on perceptions, which raises issues of subjectivity and potential biases. The present study explores the characteristics of such neighborhoods based on registry da
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Under de senaste 150 åren har det svenska landskapet genomgått mycket stora förändringar. Det har lett till förlust av livsmiljöer för många arter och har haft långtgående konsekvenser för vår inhemska fauna och flora. Många arter har minskat dramatiskt och i vissa fall helt försvunnit.När en art väl har börjat minska finns det många faktorer som kan förstärka den negativa trenden. En individrik p